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Investments in Unconsolidated Entities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Equity method investments, combined income statements |  |  |  |
Revenues | $ 1,630 | $ 1,636 | $ 3,239 | $ 3,318
Operating expenses | 1,224 | 1,168 | 2,435 | 2,398
Operating income | 406 | 468 | 804 | 920
Other expense, net | (1) | (3) | (1) | (6)
Net income | $ 405 | $ 465 | $ 803 | $ 914

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